function initialize() {
  var mapDiv = document.getElementById('map-canvas');
  var map = new google.maps.Map(mapDiv, {
    center: new google.maps.LatLng(41.8374949, -87.66503245),
    zoom: 11,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  });

  var ftLayer = new google.maps.FusionTablesLayer(139529);
  ftLayer.setMap(map);

  var marker = new google.maps.Marker({
    position: map.getCenter(),
    map: map,
    draggable: true
  });

  google.maps.event.addListener(marker, 'position_changed', function() {
    ftLayer.setQuery(
        'select * from 139529 where ' +
        'ST_INTERSECTS(col11, CIRCLE(' +
        'LATLNG' + marker.getPosition() + ', 5000))');
  });
}
